Comparative Pharmacology
Head-to-head clinical analysis: BETOPTIC S versus METOPROLOL TARTRATE AND HYDROCHLOROTHIAZIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BETOPTIC S versus METOPROLOL TARTRATE AND HYDROCHLOROTHIAZIDE.
BETOPTIC S vs METOPROLOL TARTRATE AND HYDROCHLOROTHIAZIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Betaxolol is a cardioselective beta-1 adrenergic receptor antagonist. In ophthalmic use, it reduces intraocular pressure by decreasing the production of aqueous humor, likely through blockade of beta-2 receptors in the ciliary epithelium.
Metoprolol is a cardioselective beta-1 adrenergic receptor antagonist that reduces heart rate, myocardial contractility, and blood pressure. Hydrochlorothiazide is a thiazide diuretic that inhibits the sodium-chloride symporter in the distal convoluted tubule, increasing excretion of sodium and water, thereby reducing plasma volume and blood pressure.
Instill 1 drop in the affected eye(s) twice daily.
Oral: 50-100 mg metoprolol tartrate/12.5-25 mg hydrochlorothiazide once or twice daily; maximum 200 mg metoprolol/50 mg hydrochlorothiazide per day.
None Documented
None Documented
Terminal elimination half-life is approximately 4–6 hours in adults; prolonged in renal impairment and in elderly patients due to decreased clearance.
Metoprolol: 3–7 h (terminal), clinical context: may require twice-daily dosing; prolonged in hepatic impairment. Hydrochlorothiazide: 6–15 h (terminal), clinical context: supports once-daily dosing; prolonged in renal impairment.
Renal: 0.3% unchanged; extensive hepatic metabolism to inactive metabolites; biliary/fecal elimination of metabolites accounts for the majority of excretion; total renal elimination of drug and metabolites is approximately 80%, with the remainder via feces.
Metoprolol: <5% renal (unchanged), >95% hepatic metabolism, metabolites excreted renally. Hydrochlorothiazide: >95% renal (unchanged).
Category C
Category C
Beta-Blocker
Beta-Blocker